Prepared config:
CONFIG_DRM=y
CONFIG_DRM_CLIENT_SETUP=y
CONFIG_DRM_FBDEV_EMULATION=y

Resolved DRM config after olddefconfig:
CONFIG_INPUT_TOUCHSCREEN=y
CONFIG_TOUCHSCREEN_GOODIX_BERLIN_CORE=y
CONFIG_TOUCHSCREEN_GOODIX_BERLIN_I2C=y
CONFIG_DRM=y
CONFIG_DRM_MIPI_DSI=y
CONFIG_DRM_CLIENT_SETUP=y
CONFIG_DRM_FBDEV_EMULATION=y
CONFIG_DRM_DISPLAY_HELPER=y
CONFIG_DRM_BRIDGE_CONNECTOR=y
CONFIG_DRM_CANAAN=y
CONFIG_DRM_CANAAN_DSI=y
CONFIG_DRM_LONTIUM_LT9611=y
CONFIG_DRM_PANEL_CANAAN_UNIVERSAL=y

== canaan ==
canaan_phy.c:165:6: warning: no previous prototype for ‘k230_dsi_phy1_config’ [-Wmissing-prototypes]
  165 | void k230_dsi_phy1_config(struct canaan_dsi *dsi, uint8_t hsfreq)
      |      ^~~~~~~~~~~~~~~~~~~~
canaan_dsi.c:274:6: warning: no previous prototype for ‘canaan_dsi_lpdt_init’ [-Wmissing-prototypes]
  274 | void canaan_dsi_lpdt_init(struct canaan_dsi *dsi, struct drm_display_mode *mode)
      |      ^~~~~~~~~~~~~~~~~~~~
canaan_dsi.c:499:6: warning: no previous prototype for ‘canaan_dsi_encoder_mode_fixup’ [-Wmissing-prototypes]
  499 | bool canaan_dsi_encoder_mode_fixup(struct drm_encoder *encoder,
      |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
canaan_drv.c:44:5: warning: no previous prototype for ‘canaan_drm_gem_dma_mmap’ [-Wmissing-prototypes]
   44 | int canaan_drm_gem_dma_mmap(struct drm_gem_dma_object *dma_obj, struct vm_area_struct *vma)
      |     ^~~~~~~~~~~~~~~~~~~~~~~
WARNING: modpost: canaan-drm.ko: symbol 'canaan_dsi_driver' undefined!
WARNING: modpost: canaan_dsi.ko: symbol 'k230_dsi_config_4lan_phy' undefined!
Skipping BTF generation for canaan_dsi.ko due to unavailability of vmlinux
Skipping BTF generation for canaan-drm.ko due to unavailability of vmlinux

== panel ==
Skipping BTF generation for panel-canaan-universal.ko due to unavailability of vmlinux

== bridge ==
Skipping BTF generation for lontium-lt9611-k230.ko due to unavailability of vmlinux

Built external module files:
bridge/lontium-lt9611-k230.ko
canaan/canaan-drm.ko
canaan/canaan_dsi.ko
panel/panel-canaan-universal.ko